Ingredient review

C12-14 Sec-Pareth-5

INCI: C12-14 SEC-PARETH-5

A synthetic surfactant that helps cleanse and emulsify, but may be drying for sensitive skin.

beautyskincaresurfactant

In plain English

C12-14 Sec-Pareth-5 is a man-made ingredient that helps water and oil mix together in products like face washes and lotions. It also helps remove dirt and oil from your skin. Because it's a surfactant, it can be a bit drying if you have very sensitive or dry skin.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 5

Potentially useful with some tradeoffs

The evidence base is useful, but some claims depend heavily on the formula.

Main practical flags: irritation is moderate; clogging risk is low.

Source
synthetic
Evidence
moderate
Irritation
moderate
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

C12-14 Sec-Pareth-5 can be useful, but watch for some irritation potential.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging C12-14 Sec-Pareth-5.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

moderate

Can bother some users, especially with frequent use, damaged skin, or strong companion ingredients.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A secondary alcohol ethoxylate, a type of non-ionic surfactant produced by reacting a fatty alcohol (C12-14) with ethylene oxide. It is used to lower surface tension between oil and water.

How it works

It works by surrounding oil and dirt particles, allowing them to be rinsed away with water. In creams and lotions, it helps keep the oil and water phases blended together for a stable, smooth texture.

Pros

Good cleanser

Effectively removes excess oil and impurities without the harshness of sulfates like SLS.

Emulsion stabilizer

Helps keep creams and lotions from separating, ensuring a consistent texture every time you use the product.

Cons and cautions

Potential dryness

Even though it's milder than some surfactants, it can still strip natural oils if used too often, especially on dry or sensitive skin.

Synthetic origin

Made from petrochemicals, which may be a concern for those seeking natural or eco-friendly formulations.

Best for

  • People with normal to oily skin
  • Those looking for a sulfate-free cleanser option

Use caution if

  • Those with very dry or compromised skin
  • Anyone seeking 100% natural ingredients

Usage tips

Use a moisturizer after cleansing to replenish any lost hydration.
If your skin feels tight after washing, try alternating with a creamier, non-foaming cleanser.

Safety summary

Generally considered safe for use in rinse-off cosmetics at typical concentrations. Some individuals with very sensitive skin may experience mild dryness or irritation.

Research notes

Studies on secondary alcohol ethoxylates indicate they are less irritating than some primary alcohol ethoxylates, but long-term skin exposure data is limited. Most safety data comes from industry assessments.

Common label clues

Typical concentration
1–10% depending on formulation
Regulatory status
Approved for use in cosmetics in the EU, US, and other major markets. Concentration limits are not strictly defined but formulators follow good manufacturing practices.
Common uses
Cleansers, Shampoos, Body washes, Emulsions
Environmental note
As a synthetic ethoxylate, it may have moderate biodegradability. Look for brands that prioritize eco-friendly surfactants if this is a concern.

Good to know

  • The 'sec' in the name stands for 'secondary,' referring to the position of the alcohol group on the carbon chain.
  • It is often used in rinse-off products rather than leave-on formulations to minimize potential irritation.

Common questions

What is C12-14 Sec-Pareth-5 in beauty products?

C12-14 Sec-Pareth-5 is a man-made ingredient that helps water and oil mix together in products like face washes and lotions. It also helps remove dirt and oil from your skin. Because it's a surfactant, it can be a bit drying if you have very sensitive or dry skin.

What does C12-14 Sec-Pareth-5 do in a beauty product?

It works by surrounding oil and dirt particles, allowing them to be rinsed away with water. In creams and lotions, it helps keep the oil and water phases blended together for a stable, smooth texture.

Is C12-14 Sec-Pareth-5 safe for most people?

Generally considered safe for use in rinse-off cosmetics at typical concentrations. Some individuals with very sensitive skin may experience mild dryness or irritation.

Who should be careful with C12-14 Sec-Pareth-5?

Those with very dry or compromised skin Anyone seeking 100% natural ingredients

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Alcohol EthoxylatesOpenPubChem - C12-14 Secondary Alcohol EthoxylateOpenEuropean Chemicals Agency (ECHA) - Substance InformationOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.